这段代码如何让输出的值只显示整数或者保留两位小数点,求解答。
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<form action="" oninput="x.value=parseInt(a.value)*parseInt(b.value)*0.0192+'成本'">
<p>
长:
<input type="number" id="a" min="0">
宽:
<input type="number" id="b" min="0">
<output name="x" for="a"></output>
</p>
</form>
</body>
</html>
```